projection.hpp

#ifndef PROJECTION_HPP
#define PROJECTION_HPP

void lonlat2tile(double lon, double lat, int zoom, long long *x, long long *y);
void epsg3857totile(double ix, double iy, int zoom, long long *x, long long *y);
void tile2lonlat(long long x, long long y, int zoom, double *lon, double *lat);
void tiletoepsg3857(long long x, long long y, int zoom, double *ox, double *oy);
void set_projection_or_exit(const char *optarg);

struct projection {
	const char *name;
	void (*project)(double ix, double iy, int zoom, long long *ox, long long *oy);
	void (*unproject)(long long ix, long long iy, int zoom, double *ox, double *oy);
	const char *alias;
};

extern struct projection *projection;
extern struct projection projections[];

extern unsigned long long (*encode_index)(unsigned int wx, unsigned int wy);
extern void (*decode_index)(unsigned long long index, unsigned *wx, unsigned *wy);

unsigned long long encode_quadkey(unsigned int wx, unsigned int wy);
void decode_quadkey(unsigned long long index, unsigned *wx, unsigned *wy);

unsigned long long encode_hilbert(unsigned int wx, unsigned int wy);
void decode_hilbert(unsigned long long index, unsigned *wx, unsigned *wy);

#endif